As we strive for cleaner vacuum environments, the foreline trap when used in conventional roughing or backing lines, virtually eliminates oil back-streaming from rotary pumps.Suitable for use with molecular sieve or activated alumina- depending on water vapour load. Activated Alumina is used in systems where there is higher water content than normal as Alumina is better at trapping water than a Molecular sieve. The Trap body is the same as the Ambient Copper Foreline Trap. The only difference being the charge and charge canister.Therefore the traps can be charged with metal mesh, molecular sieve or alumina.